adj. Term used to indicate a hipster connection to a nostalgic item. Also used by pop-culture elitists to determine an item as 'passe' in the hipster subculture, but can be still discussed in a sarcastic sense-literally, post-ironic.

adjective: When one's ironic appreciation of something becomes genuine, usually due to either prolonged exposure or the enjoyment derived from how amusingly terrible it is.

At first, I thought Pitchfork's inclusion of Kelly Clarkson's "Since U Been Gone" at #21 on their top 500 tracks of the 2000s list was just hipster irony... But now real hipsters post-ironically recognise it for the great song it is, go figure.

An unintentional response to Gen X's use of sarcasm, a post-ironic comment is one which the speaker actually says what they feel, but with a sarcastic tone. A post-ironic comment is usually accompanied with a wink or some other motion to make the listener feel that the speaker is joking, even though they're not.

Dan and Judy are laughing.
Judy looks at the clock and says, "Oh, I'm so sorry, Dan. I have to run, I forgot that I'm meeting up with Toby right now."
Dan says, "That's not cool. I'll never look at you the same," and laughs.
Judy asks, "Were you being post-ironic?"
Dan says, "Of course not," and laughs again.